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100mg offers better per-milligram value but creates potential waste if you can't use everything before stability expires

However, avoid layering it with strong exfoliants (like high-strength AHAs or retinoids) in the same routine to minimize irritation

Notably, GHK-Cu levels in circulation are known to decline with age, a pattern that has fueled substantial research interest in the peptide's potential relevance to tissue aging and regenerative capacity over the lifespan

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Deleve et al., 2008)

Innate immunity in plants: an arms race between pattern recognition receptors in plants and effectors in microbial pathogens